Hell is full of the dead. You should know, you put them there.
A quick and deadly encounter for the players who could make it to your game today. The others might have better, more important things to do during your game session, so make the ones who did show up pay a hefty price with a new Twilight: 2000 scenario site. This encounter is designed for fast and dirty action with zero consequenses for failure! Well, maybe a terrible night of sleep is a worthy punishment, but even if they die (and they will die), they wake up, truely no worse for the wear. Next time only one or two of your players can make it, make it memorable.